The Nashville star entered rehab for the first time in 2015 to address her addiction to alcohol and opioids, however, she later returned to drinking after she left the showbiz industry. It was during this time that her alcoholism truly started to affect her physical health. "I struggled with sleep deprivation. Sleep is massive," the Heroes actress told Women's Health magazine. "It affects your motor skills, your ability to think and your overall health.” Hayden Panettiere / Women's Health magazine